Intrinsics are gained through consuming corpses, much like increasing attributes via the same method, although it is not a for sure thing that consuming the corpse will give you the intrinsic. A gained intrinsic will always give you a message letting you know, as in "feeling full of hot air" after gaining cold resistance.
There is usually risk involved in eating corpses to gain intrinsics. Two main threats are possibly poisoning yourself with a red back blob or cobra meat, and burning yourself by eating red molds.
List of intrinsics and corpses possibly providing them:
- Cold Resistance- Brown mold, Winter wolf/pup
- Fire Resistance- Red mold, Hellhound/pup
- Poison Resistance- Rabid rat, Red back, Cobra, Blob of killer Bee goo
- Teleport Control - (?)
- Teleport - Nymph, Piece of leprechaun innards, Tengu (a message states, "You feel Jumpy.")
- ESP - Floating Eye, Mindflayer / Master mindflayer